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Mr Sly, who farms at Thorney, Cambridgeshire, added: “Many people in Yorkshire, the East Midlands and East Anglia will know that beet is grown locally, yet Tesco is denying them the opportunity to back British farming by switching to cane sugar.”

Tesco said it had reviewed its ranges and suppliers for sugar.

Responding to queries from frustrated shoppers on Twitter, the retailer said: “We have decided to change our supplier from Silver Spoon to Tate &